EVA Ultra Transparent Casting Film Production Line

EVA Ultra Transparent Casting Film Production Line

Core Configuration Description of EVA Film Extrusion Production Line

This production line is specifically designed for manufacturing high-performance EVA (Ethylene-Vinyl Acetate) encapsulation film. Its core equipment is precisely configured according to the process flow to ensure the film possesses excellent optical properties, uniformity, and reliability.

• Host Machine: High-Efficiency Extrusion Unit
  The core of the production line is a single-screw or twin-screw extruder, responsible for the efficient plasticization, homogenization, and stable conveying of EVA resin and additives, providing a uniform and stable melt for subsequent processes.
• Melt Metering Pump: Core for Pressure and Flow Stability
  Installed at the outlet of the host machine, it is used for precise metering and stable output of the melt. It effectively eliminates screw pulsation, providing constant extrusion pressure and flow, making it key equipment for ensuring longitudinal thickness uniformity of the film.
• Hydraulic Screen Changer: On-line Melt Filtration Device
  Utilizing hydraulic drive, it allows for rapid screen changes during uninterrupted production, continuously filtering impurities and gel particles from the melt. This safeguards the film’s purity and optical performance and extends continuous operation time.

Die: Key to Film Formation

A precision-manufactured T-type coat-hanger die is employed. Its internal flow channel is specially designed to enable uniform distribution of the melt along the width of the die lip. This is fundamental for achieving consistent transverse film thickness and supports customization for different widths.

Three-Roll Calender: Precision Cooling and Sizing System
Composed of three chrome-plated, precision-processed cooling rolls. The molten film from the die is quickly calendered, cooled, and solidified here. The surface accuracy and temperature uniformity of these rolls directly determine the film’s initial flatness, gloss, and dimensional stability.

Roll Temperature Control System: Precise Management of Cooling Process
Equipped with an independent circulating temperature control system for the cooling roll set, allowing precise setting and stable control of each roll’s temperature. This optimizes the cooling rate and effectively regulates the film’s crystallization state, surface properties, and shrinkage.

Rotary Side Trim Unit: Precise Width Control Unit
Located on both sides of the film, it uses high-speed rotating, sharp circular knives to perform online synchronous trimming of the film edges, ensuring precise and consistent finished roll width with neat trim.

Edge Trim Wind-Up Unit: Automatic Edge Material Recovery
Automatically winds the trimmed edge material into rolls, achieving neat and continuous recovery of edge trim. This facilitates subsequent centralized processing or reuse and helps improve material utilization.

Traction Machine: Constant Tension Conveying Mechanism

It typically consists of multiple sets of rubber rollers and steel rollers, providing stable traction. Its precision tension control system ensures constant tension of the film during cooling, edge trimming, and thickness measurement, preventing stretching deformation.

Thickness Gauge: On-line Quality Monitoring Eye
Employs non-contact scanning thickness gauges (such as beta-ray or infrared). It performs transverse continuous scanning of the film during high-speed line operation, enabling real-time, precise monitoring and recording of the thickness profile. This is the core sensor for closed-loop quality control.

PLC Automatic Control System: Intelligent Command Center
Using a Programmable Logic Controller as the control core, it enables human-machine interaction via an industrial touchscreen. It integrates control over all key parameters of the entire production line, including temperature, pressure, speed, and tension, achieving process standardization and production automation.

Automatic Winding Machine: Finished Product Winding Terminal
Equipped with a dual-position turret, enabling fully automatic roll change and winding. Utilizing advanced tension or torque control modes ensures consistent roll tightness and neat edges. It integrates automatic cutting and core attachment functions.

Core Advantages of the Production Line

• Excellent Optical Uniformity: Combines precision die, melt pump, and automatic thickness feedback system to ensure the film has extremely high thickness uniformity, light transmittance, and low haze.
• Advanced Process Control: Key process points of the entire production line are integrated and controlled by the PLC system. Closed-loop adjustment via online thickness measurement ensures stable and reproducible product quality.
• Flexible Production Adaptability: By changing the die, adjusting formulations and processes, films of different widths, thicknesses, and functional requirements (such as anti-PID, high adhesion) can be produced to meet diverse market demands.
• Efficient Operation and Energy Saving: The melt pump improves extrusion efficiency, and automatic edge trim recovery increases raw material utilization. The overall design aims to reduce unit energy consumption and production costs.

Main Application Fields of the Product

The high-quality EVA film produced by this line is a key encapsulation material in several high-end manufacturing sectors:

Photovoltaic New Energy: Serves as the core encapsulation adhesive film for solar cell modules, used for bonding cell slices, glass, and backsheets. It is crucial for the module’s weather resistance, insulation, and power generation efficiency, widely used in conventional modules, double-glass modules, and BIPV (Building Integrated Photovoltaics).

High-End Glass Manufacturing: Used in producing architectural laminated glass, automotive windshields and sunroofs, and various impact-resistant and safety glass, providing high-strength bonding, impact resistance, and sound insulation properties.

Electronics and Display Industry: Used as surface protection film for displays, base film for touchscreen, Optical Clear Adhesive (OCA), etc., requiring extremely high cleanliness and optical performance.

Special Application Fields

Encompasses agricultural PV greenhouse cover film, artistic decorative laminated glass materials, high-end optical composite films, and medical device packaging, among other scenarios with stringent material performance requirements.